JP2003185784A - Equipment for maintenance and repair of reactor internal structures - Google Patents

Abstract

(57) [Summary] [Problem] To enable accurate positioning and scanning movement of construction tools and the like when inspecting, maintaining and repairing structures inside a reactor underwater remotely. A maintenance / repair work support device 1 capable of being inserted / removed into the inside of the tubular portion, and an inspection of the outer surface of the tubular portion driven by the maintenance / repair work support device along the outer surface of the tubular portion 150; A maintenance / repair scanning mechanism unit 30 for performing maintenance or repair, wherein the maintenance / repair operation support device includes a maintenance / repair operation support device, wherein the maintenance / repair operation support device has a radius of the cylindrical portion in a state of being inserted into the cylindrical portion. A deployment mechanism 4a capable of spreading in the direction, a magnet 13 attached near the tip of the deployment mechanism and arranged to face the inner surface of the tubular portion;
A moving mechanism 8 for moving the magnet along the inner surface of the cylindrical portion,
The maintenance / repair scanning mechanism is configured to be attracted by the magnet and driven to follow the movement of the magnet by the moving mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maintenance / repair device for a nuclear reactor, and more particularly, to preventive maintenance, post-maintenance and repair of a tubular portion such as a jet pump diffuser pipe in a boiling water reactor. The present invention relates to a maintenance / repair device in a reactor suitable for remotely performing underwater maintenance work.

[0002]

2. Description of the Related Art The internal structure of a light water reactor, such as a boiling water reactor, is made of a material having sufficient corrosion resistance and high temperature strength under high temperature and high pressure environment, such as austenitic stainless steel or nickel base alloy.

However, among the reactor internals, the difficult-to-replace members are exposed to a harsh environment due to long-term operation of the plant, and there is a concern of material deterioration due to the influence of neutron irradiation. . In particular, in the vicinity of the welded portion of the in-core structure, there is a potential risk of stress corrosion cracking due to sensitization of the material due to welding heat input and the effect of tensile residual stress.

The structure inside the reactor pressure vessel, which is the target of preventive maintenance and repair of the nuclear reactor, has complicated and narrow locations (see, for example, Japanese Patent Laid-Open No. 11-174191). The welded structure existing in the space (annulus portion) partitioned by the outer wall of the shroud shell and the baffle plate of the boiling water reactor and the inner wall of the reactor pressure vessel is particularly complicated and narrow.

A main welded structure existing in a space partitioned by the outer wall of the shroud shell, the baffle plate, and the inner wall of the reactor pressure vessel is a jet pump. The jet pump is a pump having a complicated shape composed of elements such as a riser pipe, an inlet mixer and a diffuser pipe.

[0006]

The diffuser pipe of a jet pump is composed of a conical tubular pipe called a shell, a cylindrical pipe called a tail pipe, and a cylindrical pipe called an adapter pipe from the top. Further, it is composed of two cylindrical tubes, and the lower end of the adapter tube is welded to the baffle plate. Each of them is a welded structure and has a potential risk of stress corrosion cracking.
The portion to be constructed in the present invention is, for example, in the vicinity of the welded portion on the inner and outer surfaces of the diffuser pipe. In particular, the differential pressure instrumentation pipe runs horizontally around the tail pipe in a gap with the outer wall of the shroud, which makes it difficult to access the welding line below it.

An object of the present invention is to solve the above problems, and for inspection, maintenance and repair of a tubular structure inside a narrow reactor such as a welded portion of a diffuser pipe of a jet pump, An object of the present invention is to provide an apparatus that enables accurate positioning and scanning movement of construction tools and the like when remotely operating in water when the reactor is stopped.

[0008]

The present invention achieves the above object, and the invention of claim 1 enables insertion / removal into / from a tubular portion in the reactor when the reactor is shut down. A maintenance / repair work support device, and a maintenance / repair scanning driven by the maintenance / repair work support device along the outer surface of the tubular portion to perform at least one of inspection, maintenance, and repair of the outer surface of the tubular portion. Maintenance of the reactor
A repair device, wherein the maintenance / repair work support device is mounted in a vicinity of a tip end portion of the deploying mechanism and a deploying mechanism capable of expanding in a radial direction of the tubular part while being inserted into the tubular part. And a moving mechanism that moves the magnet along the inner surface of the tubular portion, the magnet being disposed so as to face the inner surface of the tubular portion, and the maintenance / repair scanning mechanism portion, It is configured to be attracted by the magnet and to be driven following the movement of the magnet by the moving mechanism.

According to a second aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the moving mechanism comprises:
The magnet is configured to be movable in the axial direction and the circumferential direction of the tubular portion.

According to a third aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair work support device has a lock mechanism fixed to the tubular portion, The moving mechanism is configured to move the magnet relative to the lock mechanism.

According to a fourth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the deployment mechanism is
It is characterized by using a link mechanism.
Further, the invention of claim 5 is the maintenance / repair device in the reactor according to claim 1, wherein the maintenance / repair work support device is pressed against the inner surface of the tubular portion and is rotatable along the same. It has a flexible wheel.

According to a sixth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair scanning mechanism section is made of a magnetic material, and rotates along the outer surface of the tubular section. It has possible wheels.

According to a seventh aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair scanning mechanism section is a servo-driven scanning mechanism having at least two degrees of freedom. It is characterized by having.

Further, the invention of claim 8 is the apparatus for maintenance and repair in the nuclear reactor according to claim 1, wherein the tubular portion in the nuclear reactor is a jet pump diffuser pipe.

According to a ninth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair scanning mechanism portion is for irradiating the outer surface of the cylindrical portion with laser light. An optical head is attached, and an optical cable for sending light to the optical head is provided.

According to a tenth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the ninth aspect, the maintenance / repair scanning mechanism unit condenses the laser light on the outer surface of the cylindrical portion. It has an automatic focusing mechanism for.

According to a tenth aspect of the present invention, in the nuclear reactor internal maintenance / repair device according to the ninth aspect, the maintenance / repair scanning mechanism portion has water on the outer surface of the cylindrical portion irradiated with the laser beam. Alternatively, a nozzle for injecting gas and a hose for supplying water or gas to the nozzle are provided, and the hose is at least partially integrated with the optical cable to form a composite structure.

According to a twelfth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the eleventh aspect, the composite structure is a structure in which the optical cable is arranged in a space through which the water or gas passes. There is a feature.

According to a thirteenth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair scanning mechanism section applies an ultrasonic wave to the outer surface of the cylindrical section to superimpose the ultrasonic waves. Having an ultrasonic sensor for receiving reflected waves of sound waves,
Is characterized by.

According to a fourteenth aspect of the present invention, in the nuclear reactor maintenance / repair device according to the first aspect, the maintenance / repair scanning mechanism portion is configured to set a ferrite content of a metal surface layer on an outer surface of the tubular portion. Having a measuring system for measuring.

According to a fifteenth aspect of the present invention, in the in-reactor maintenance / repair device according to the first aspect, the device is attached near the tip of the expansion mechanism and is driven along the inner surface of the tubular portion, It further comprises an inner surface maintenance / repair scanning mechanism section for performing at least one of inspection, maintenance and repair of the inner surface of the tubular portion.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a maintenance / repair work support apparatus 1 of an embodiment of a reactor maintenance / repair apparatus according to the present invention.
Diffuser pipe for boiling water reactor jet pump 1
The state installed in 50 is shown. The diffuser pipe 150 is installed in the reactor pressure vessel (not shown) in the baffle plate 13
3 is welded on. Before the maintenance / repair work support device 1 is installed as shown in FIG. 1, the reactor is shut down, the lid (not shown) of the reactor pressure vessel is opened, and the jet positioned above the diffuser pipe 150 is opened. The inlet mixer (not shown) of the pump is removed, and the opening 150a at the upper end of the diffuser pipe 150 is opened.
Further, the entire periphery of the diffuser pipe 150 shown in FIG. 1 is filled with water.

The maintenance / repair work support device 1 has a vertically long appearance that can be inserted through the opening 150a at the upper end of the diffuser pipe 150, and can be opened by a structure such as a pneumatic cylinder 2, a support 3, and an umbrella. It is composed of an arm 4 having a link structure that can be closed, a pressing pad 6 having a ball point roller 5 at the tip of the arm 4, a lock mechanism 7, and an elevating / rotating mechanism 8.

In the present embodiment, the arm 4 having a link structure is used.
An example in which the number of is composed of four is shown. Each arm 4 can be opened and closed at the same time by a link 4a, and its driving is performed by a pneumatic cylinder 2. The pneumatic cylinder 2 is a spring return type cylinder, and the arm 4
In the closing direction, the air pressure can be operated only by the restoring force of the spring.

The lock mechanism 7 is composed of a pneumatic cylinder 9, two pairs of extension link mechanisms 10, and a pad 11, and the base portion 12 of the maintenance / repair work support device 1 is installed inside the end inlet of the diffuser pipe 150. It has a fixed function.
An electromagnet 13 is built in one or a plurality of arms 4, and a maintenance / repair scanning mechanism unit 30 (see FIG. 2), which will be described later, can be magnetically attracted via the wall surface of the diffuser tube 150.

FIG. 2 shows the maintenance / repair work support device 1 of FIG.
An embodiment of the maintenance / repair scanning mechanism section 30 used in combination with the above is shown. The maintenance / repair scanning mechanism unit 30 includes a base unit 31, a scanning mechanism 32, a pressing mechanism 33, a tool mounting unit 34, and various tool heads 35. The base unit 31 has a plurality of ball caster-shaped rotatable wheels 36 made of a magnetic material, and the layout thereof is the same as the positions and numbers of the N poles and S poles of the electromagnet 13 in FIG.

The scanning mechanism 32 is a linear movement mechanism having two orthogonal degrees of freedom, and has two servo motor drive mechanisms 37a and 37a.
b, ball screws 38a, 38b, linear guide 39
a, 39b. The pressing mechanism 33 includes a linear guide 40 and a pneumatic cylinder 41. The tool mounting portion 34 is, for example, a bolt-joint joint portion that incorporates a composite underwater connector 44 in which a commercially available pneumatic connector 42, electric connector 43, and the like are assembled.

In this embodiment, first, an inlet mixer (not shown) including a head bolt, a 180-degree elbow, a barrel, etc., which are components of a jet pump, is removed, and the upper end of the diffuser pipe 150 can be seen from above. Then, the maintenance / repair work support device 1 is inserted through the opening 150a. The maintenance / repair work support device 1 is hung down into the water in the furnace by using a hanging tool (not shown), and the opening 1
Insert the diffuser tube 150 into the diffuser tube 150.

The external dimensions of the maintenance / repair work support device 1 are
It can be made smaller than the opening 150a at the upper end of the diffuser pipe 150 when the link 4a is closed, and larger than the inner diameter of the diffuser pipe 150 when the link 4a is open. Pad 1 of lock mechanism 7 with link 4a closed
Maintain the position where 1 reaches the upper end of the diffuser pipe 150.
The repair work support device 1 is inserted into the diffuser pipe 150, and at that position, the link mechanism 10 is operated by the pneumatic cylinder 9 of the lock mechanism 7 to press the pad 11 against the inner wall of the diffuser pipe 150 to perform the maintenance / repair work support device. The base portion 12 of 1 is fixed.

Further, pressure is applied to the pneumatic cylinder 2 to open the link 4a, and the pressing pad 6 at the tip of the arm 4 is pressed against the inner wall of the diffuser pipe 150. Pressing pad 6
A roller 5 is attached to the roller 5, and can be rotated in the circumferential direction and moved in the axial direction along the wall surface by driving the mechanism of the rotation / elevation mechanism 8. A strong electromagnet 13 is built in one of the pressing pads 6, and the maintenance / repair scanning mechanism section 30 is provided.
(FIG. 2) can be magnetically adsorbed through the wall surface of the diffuser tube 150, and while adsorbing this, the maintenance / repair scanning mechanism section 30 can be moved to an arbitrary position by the operation of the rotation / elevation mechanism 8. It is possible.

Next, the maintenance / repair scanning mechanism section 30 is hung down in the furnace by a hanging tool and brought close to the outer wall of the diffuser pipe 150. When the wheels 36 of the maintenance / repair scanning mechanism unit 30 approach the electromagnet 13 of the maintenance / repair work support device 1 pressed against the inner wall of the diffuser pipe 150, a magnetic field is formed, and the maintenance / repair scanning mechanism unit 30 causes the diffuser pipe 15 to move.
0 Adsorbed on the outer wall.

The number of wheels 36 and the number of electromagnets 13 are the same and one to one.
Corresponding to each other, they adhere to each other, and the maintenance / repair scanning mechanism section 3
The posture of 0 is uniquely determined, and it is possible to move on the outer wall of the diffuser pipe 150 while maintaining this posture.
After the adsorption, the pressing mechanism 33 presses the tool head 35 against the wall surface, and the two degrees of freedom of the scanning mechanism 32 are used to carry out construction within a certain range. For example, in the case of laser peening (described later, refer to FIG. 3), a specific method is to use one axis for the scanning axis and the other axis for the feed axis. The scanning axis is repeatedly scanned and moved at a constant speed, and the construction is performed by moving the feed axis by one pitch for each scanning movement.

The tool mounting portion 34 has a built-in compound underwater connector 44, and a utility that can be shared by various tools, for example, purge pressure, water, gas supply, etc., is a connector of the tool mounting portion 34. It is also possible to receive supply via.

Conventionally, for example, in the preventive maintenance and repair work of the welding line around the lower part of the diffuser pipe 150 of a jet pump, the target portion is narrow and the entry route is obstructed by the differential pressure instrumentation pipe. , Was extremely difficult to implement. However, as shown in FIGS. 1 and 2, the diffuser tube 1
Access is facilitated by inserting and guiding the maintenance / repair work support device 1 having the electromagnet 13 inside the 50. Conventionally, a method of directly moving the outer surface of the diffuser pipe 150 with a single construction device has been adopted, but according to the present embodiment, it is possible to realize accurate and highly reliable construction with an extremely small and lightweight construction device. .

FIG. 3 shows a laser peening head 4 as a tool head 35 of the maintenance / repair scanning mechanism section 30 shown in FIG.
An example in which 5 is attached is shown. The laser peening head 4
Reference numeral 5 mainly includes a composite cable 49 including an optical fiber cable 46 for transmitting a laser beam, a water supply hose 47, and an electric signal cable 48, an underwater connector section 50, an autofocus mechanism 51, and a water jet nozzle 52. Composed. The autofocus mechanism 51 further has a structure in which the ultrasonic motor 55 is used as a drive actuator to move the condenser lens 54 in parallel.

Usually, tensile stress remains on the surface of the welded structure near the welded portion during welding. Stress corrosion cracking may occur when exposed to radiation for a long time in water containing dissolved oxygen while keeping the tensile stress on the surface as it is. This stress corrosion cracking can be prevented by making the surface stress state near the welded portion into a compressive stress state by mechanical processing.

A laser peening method is one of the stress improving methods. Laser peening is a processing method in which a metal surface is pulse-irradiated with laser pulse light having a powerful output level under water. The principle is a method in which a metal plasma is generated on the irradiated surface with intense light energy, and the surface stress state is changed to compression by the pressure wave when the plasma is generated. In this construction method, it is important to transmit a powerful pulsed laser light to the target object in the furnace.

As shown in FIG. 3, the optical fiber cable 4
According to the method of transmission using 6, compared with the transmission tube method that requires mechanical deformation in accordance with the movement of the head,
Since the optical fiber transmission is flexible against bending, it is possible to easily send light even in an environment where there are obstacles in the shroud barrel and the differential pressure instrumentation pipe, and it is also possible to rotate around the diffuser pipe 150. Become.

In the laser peening process, the sheath tube 5 is used.
In addition to the optical fiber cable 46 protected by 8, it is necessary to protect the irradiation optical path with transparent water that does not contain impurities that obstruct the optical path, and a water supply hose 47 for supplying clean water is required. Further, an automatic focusing mechanism 51 for automatically correcting the focal length is also required, and this electric signal cable 48
Is also necessary.

Since the optical fiber transmission type laser peening has a shallow depth of focus, it is necessary to accurately focus on the construction object. The target of construction is curved, and the vicinity of the weld is often an irregular curved surface due to molten metal, etc.
It is necessary to adjust the focus in real time.

The autofocus mechanism 51 is composed of a small ultrasonic motor 55 that moves the condenser lens 54 in parallel by using the ultrasonic motor 55 as a drive actuator. This is referred to as a photo sensor (not shown). It is automatically controlled by a control circuit (not shown) that feedback-controls the focus position so that the return amount of light is maximized. The photosensor measures the amount of return light of the reference laser light for focus measurement from the irradiation point existing on the operation floor side above the reactor pressure vessel.

The function of automatic focus control is to drive the ultrasonic motor 55 to move the condenser lens 54 in a sine wave shape based on a command from the control circuit, and the center of vibration of the sine wave is always the average of the return light captured by the photo sensor. Control to maximize the value. The position where this return light is maximum is the focal position.

In the above description, an example in which the laser peening head 45 is attached as a tool head has been shown. It is similarly possible to use other laser processing machines (laser welding machines, laser desensitization processing machines, etc.) as the tool head. As a result, it is possible to perform optical transmission by an optical fiber to a processing machine that performs preventive maintenance and post-fault maintenance of stress corrosion cracking that occurs near the welded portion.

By using the optical fiber shown in FIG. 3 in the optical transmission system, the movement of the maintenance / repair scanning mechanism section 30 becomes light, and it cannot be realized by the conventional spatial transmission type system using the light guide tube. It becomes accessible.

FIG. 4 shows an example of a concrete embodiment of the structure of the composite cable 49 of FIG. Generally, the optical fiber cable 46 used in the laser processing machine has a wire diameter of 1 m.
Although it is an elongated pure quartz glass of about m, the fiber cable 46 made of pure quartz glass is weak against bending and is protected by a sheath tube 58 for limiting the bending radius. The sheath tube 58 has an outer diameter of several millimeters, and the inside is almost hollow.

In the embodiment of FIG. 4, the sheath tube 58 is
It is a composite cable having a special structure in which the space between the optical fiber cable 46 and the optical fiber cable 46 can be used as a water pipe (or a gas air pipe). An underwater connector 50 is prepared at the end of the laser peening head 45. The underwater connector 50 includes pneumatic couplers 50a and 50b rotatable about an axis.
The optical connectors 50c and 50d are built in the shaft center of the shaft, and can be rotated around the shaft during connection.

Here, the gas supply pipe is used for injecting an inert gas for making the welded part partially in the air when welding is performed by a laser beam machine, for example. The water supply hose 47 is inserted into the optical fiber cable 46 by using the composite cable 49.
By inserting the electric signal cable 48, the cable can be simplified.

An electric signal cable 48 is wound around a twist with the optical cable fiber 46 as an axis, and the space between these cables and the sheath tube 58 is used as a hose for transmitting gas or water, and a composite cable 49 is provided for space. To effectively utilize. Further, since there is only one cable, the bending and thickness of the composite cable can be handled very easily, and the operation of the maintenance / repair scanning mechanism unit 30 can be lightened.

The underwater connector 50 at the coupling portion of the laser peening head 45 is a rotatable pneumatic coupler 50.
Since the optical connectors 50c and 50d are built in the shaft centers of a and 50b, the optical connectors 50c and 50d are rotatable with respect to the twist of the shaft center, and the maintenance / repair scanning mechanism unit 30 is rotated when the construction device is inserted or mounted. However, the composite cable 49 is not twisted.

FIG. 5 shows the maintenance / repair scanning mechanism unit 30 of FIG.
An example in which a distance measuring sensor 60 incorporating an ultrasonic distance transmitting sensor and an ultrasonic distance receiving sensor is attached in the vicinity of the tool mounting portion 34, and scanning and pressing operations can be performed together with the tool head 35 will be described. With this configuration, the ultrasonic distance sensor 60 can measure the distance between the tool head 35 and the construction surface during construction.

When the distance sensor 60 is attached in the vicinity of the tool mounting portion 34, the distance sensor 60 is attached together with the tool head 35.
Since it also moves, it is possible to control the distance between the tool head 35 and the wall surface by detecting the distance to the wall surface and adjusting the pressing amount with this, and in various tool heads 35, from the tool head 35 to the construction surface. It becomes possible to align the distances.

Generally, in an optical fiber transmission type laser processing machine, the depth of focus becomes narrower, and it is necessary to focus the laser light on the construction surface with high accuracy. However, it was transmitted from the transmitter by using an ultrasonic sensor. By measuring the reflected sound of the sound with the receiver and measuring its transmission time accurately, it is possible to obtain the distance from the laser processing machine to the construction surface with high accuracy using the principle of triangulation with high accuracy. High laser processing can be provided. In addition, with the ultrasonic sensor, during further construction,
A method can also be used in which the distance meter is used based on the transmission time of the sound generated by the processing sound from the construction point.

FIG. 6 shows the above-mentioned maintenance / repair scanning mechanism unit 30.
An example of mounting a sensing system for measuring the ferrite content of the metal surface layer, which is composed of the pneumatic piston 61, the linear guide 62, and the ferrite scope 63, is shown in FIG. Here, the ferrite scope 63 is a metal (stainless steel)
This is a sensor for nondestructively measuring the ferrite content of.
Since the maintenance / repair scanning mechanism unit 30 has the ferrite scope 63 built therein, the ferrite content on the metal surface can be measured, and the base material and the molten metal can be distinguished from the value of the content.

By mounting the ferrite scope 63, even when the boundary between the molten metal and the base metal cannot be visually judged because the welded portion of the surface to be constructed is perfectly polished,
By measuring the ferrite content on the surface with this sensor, it is possible to determine the boundary between the molten metal and the base material. Accordingly, for example, when it is necessary to perform only a range of several mm from the vicinity of the molten metal such as laser peening for stress improvement, the construction start point can be accurately determined, and It is not necessary to construct a wide area as necessary, and the construction efficiency is increased and the construction cost is reduced.

FIG. 7 shows a modification of the maintenance / repair work support device 1 shown in FIG. 1, in which a tool 71 is attached to one of the arms 4. As a result, not only the outer wall but also the inner wall of the diffuser pipe 150 of the jet pump can be maintained and repaired. In this way, there is an economic effect that it is possible to maintain and repair both inside and outside with one system. This also has a side effect of enabling simultaneous work such as ultrasonic flaw detection inspection from the inside while performing repair welding on the outside.

In the above embodiment, the maintenance and repair of the diffuser pipe 150 of the jet pump was described as an example, but the target site is not limited to the diffuser pipe 150 of the jet pump, but a tubular shape in the reactor. Widely applicable to things. It can also be applied to an apparatus that performs only inspection.

[0057]

EFFECTS OF THE INVENTION According to the present invention, a maintenance / repair device for a reactor with high accessibility and mobility can be realized, and maintenance / repair of a diffuser pipe of a jet pump, which has been difficult to carry out with conventional equipment for handling reactors, Repairs can also be carried out.

[Brief description of drawings]

FIG. 1 Maintenance of a reactor internal maintenance / repair device according to the present invention
It is a diagram showing an embodiment of a repair work support device,
(A) is a partially cutaway elevation view of the state where it is put in a jet pump diffuser, and (b) is an elevation view of the pressing pad of (a) taken along the line BB.

[Fig. 2] Maintenance of the reactor internal maintenance / repair device according to the present invention
It is a figure showing one embodiment of a repair scanning mechanism part,
(A) is a front view, (b) is a left side view of (a), (c) is a plan view of (b) seen from above.

3 is a partially cutaway enlarged elevation view of an embodiment of a laser peening head which is an example of the tool head of FIG.

FIG. 4 is an enlarged vertical cross-sectional view of the vicinity of the underwater connector portion with the underwater connector of FIG. 3 removed.

[Fig. 5] Maintenance of the reactor internal maintenance / repair device according to the present invention
It is a figure which shows the embodiment different from FIG. 2 of a repair scanning mechanism part, (a) is a front view, (b) is a left side view of (a), (c) is a top view of (b). The plan view seen.

FIG. 6 Maintenance of the reactor internal maintenance / repair device according to the present invention
6A and 6B are views showing an embodiment of the repair scanning mechanism portion different from FIG. 2 or FIG. 5, wherein (a) is a front view and (b) is (a).
Left side view, (c) is a plan view of (b) seen from above.

FIG. 7: Maintenance of the reactor internal maintenance / repair device according to the present invention
FIG. 2 is a partially cutaway elevational view of a repair work support device in an embodiment different from that of FIG. 1 inserted in a jet pump diffuser.

[Explanation of symbols]

1 ... Maintenance / repair work support device, 2 ... Pneumatic cylinder, 3 ...
Prop, 4 ... Arm, 5 ... Roller, 6 ... Press pad, 7
... Lock mechanism, 8 ... Lifting / rotating mechanism, 9 ... Pneumatic cylinder, 10 ... Overhanging link mechanism, 11 ... Pad, 12 ... Base part, 13 ... Electromagnet, 30 ... Maintenance / repair scanning mechanism part,
31 ... Base unit, 32 ... Scanning mechanism, 33 ... Pressing mechanism, 34 ... Tool mounting part, 35 ... Tool head, 36 ... Wheels, 37a, 37b ... Servo motor drive mechanism, 38a,
38b ... Ball screw, 39a, 39b ... Linear guide,
40 ... Linear guide, 41 ... Pneumatic cylinder, 42 ... Pneumatic connector, 43 ... Electrical connector, 44 ... Underwater connector,
45 ... Laser peening head, 46 ... Optical fiber cable, 47 ... Water supply hose, 48 ... Electrical signal cable, 4
9 ... Composite cable, 50 ... Underwater connector, 50a, 50
b ... Underwater coupler, 50c, 50d ... Optical connector, 51 ...
Automatic focusing mechanism, 52 ... Water jet nozzle, 54 ... Condensing lens, 56 ... Photo sensor, 57 ... Control circuit, 58 ...
Sheath tube, 60 ... Distance measuring sensor, 61 ... Pneumatic piston, 62 ... Linear guide, 63 ... Ferrite scope,
71 ... Tool, 133 ... Baffle plate, 150 ... Diffuser tube, 150a ... Opening part.

Continued front page    (72) Inventor, Inakura Hiroaki             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office (72) Inventor Satoshi Okada             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office (72) Inventor Nobuichi Suezono             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office

Claims (15)

[Claims] 1. A maintenance / repair work support device capable of being inserted / removed into / from a tubular part inside the reactor when the reactor is stopped, and the maintenance / repair work support device along the outer surface of the tubular part. A maintenance / repair device for in-reactor, comprising: a maintenance / repair scanning mechanism unit that is driven and driven to perform at least one of inspection, maintenance, and repair of the outer surface of the tubular portion. Is a deployment mechanism that can be expanded in the radial direction of the tubular portion when inserted into the tubular portion, and is mounted near the tip of the deployment mechanism so as to face the inner surface of the tubular portion. A magnet arranged, and a moving mechanism that moves the magnet along the inner surface of the tubular portion, the maintenance / repair scanning mechanism portion is attracted by the magnet, and the moving mechanism moves the magnet. Driven following movement Be configured urchin, reactor maintenance and repair apparatus according to claim. 2. The nuclear reactor maintenance / repair device according to claim 1, wherein the moving mechanism is configured to move the magnet in an axial direction and a circumferential direction of the tubular portion. This is a maintenance / repair device for nuclear reactors. 3. The in-reactor maintenance / repair device according to claim 1, wherein the maintenance / repair work support device has a lock mechanism fixed to the tubular portion, and the moving mechanism includes the lock mechanism. A maintenance / repair device in a nuclear reactor, wherein the magnet is configured to move relative to the mechanism. 4. The in-reactor maintenance / repair device according to claim 1, wherein the deploying mechanism uses a link mechanism. 5. The nuclear reactor maintenance / repair device according to claim 1, wherein the maintenance / repair work support device includes a free wheel that is pressed against the inner surface of the tubular portion and is rotatable along the inner surface. An internal reactor maintenance / repair device characterized by having 6. The in-reactor maintenance / repair device according to claim 1, wherein the maintenance / repair scanning mechanism section is made of a magnetic material, and has wheels rotatable along an outer surface of the tubular section. Reactor maintenance / repair device characterized by 7. The nuclear reactor maintenance / repair device according to claim 1, wherein the maintenance / repair scanning mechanism section has a servo-driven scanning mechanism having at least two degrees of freedom. Maintenance / repair device for nuclear reactor. 8. The nuclear reactor internal maintenance / repair device according to claim 1, wherein the tubular portion in the nuclear reactor is a jet pump diffuser pipe.
Repair device. 9. The nuclear reactor maintenance / repair device according to claim 1, wherein an optical head for irradiating the outer surface of the cylindrical portion with a laser beam is attached to the maintenance / repair scanning mechanism section. An internal maintenance / repair device for a reactor characterized by having an optical cable for sending light to this optical head. 10. The nuclear reactor maintenance / repair device according to claim 9, wherein the maintenance / repair scanning mechanism section has an automatic focusing mechanism for concentrating the laser light on the outer surface of the tubular section. This is a maintenance / repair device for nuclear reactors. 11. The nuclear reactor maintenance / repair device according to claim 9, wherein the maintenance / repair scanning mechanism section includes a nozzle for injecting water or gas onto the outer surface of the cylindrical section irradiated with the laser beam. An apparatus for maintenance and repair in a nuclear reactor, comprising a hose for supplying water or gas to the nozzle, the hose being at least partially integrated with the optical cable to form a composite structure. 12. The nuclear reactor maintenance / repair device according to claim 11, wherein the composite structure is a structure in which the optical cable is arranged in a space through which the water or gas passes. Maintenance / repair device for nuclear reactor. 13. The nuclear reactor maintenance / repair device according to claim 1, wherein the maintenance / repair scanning mechanism unit applies an ultrasonic wave to an outer surface of the tubular portion and receives a reflected wave of the ultrasonic wave. An internal reactor maintenance / repair device characterized by having an ultrasonic sensor. 14. The nuclear reactor maintenance / repair device according to claim 1, wherein the maintenance / repair scanning mechanism section has a measuring system for measuring the ferrite content of the metal surface layer on the outer surface of the tubular section. Reactor maintenance / repair device characterized by 15. The nuclear reactor maintenance / repair device according to claim 1, wherein the device is attached near the tip of the expansion mechanism and is driven along the inner surface of the tubular part, and the inner surface of the tubular part is An in-reactor maintenance / repair device further comprising an inner surface maintenance / repair scanning mechanism section for performing at least one of inspection, maintenance, and repair.